<p>
  Various types of elements can be present on a pipeline. 
    
  Blocks can have different states: idle, ready, or executed. These are color coded as
  <table cellspacing="3" class="body" cellpadding="2" border="1">
      <colgroup>
        <col width="10%"/>
        <col width="10%"/>
        <col width="10%"/>
      </colgroup>
    <tr valign="top">
      <td bgcolor="#ADC8FF">
        <p>idle</p>
      </td>
      <td bgcolor="#35A400">
        <p>ready</p>
      </td>
      <td bgcolor="#CFBFFF">
        <p>executed</p>
      </td>
    </tr>
  </table>
  
  The following table describes these elements:
  
  <p>
    <table cellspacing="0" class="body" cellpadding="2" border="1" width="80%">
      <colgroup>
        <col width="20%"/>
        <col width="15%"/>
        <col width="15%"/>
        <col width="50%"/>
      </colgroup>
      <thead>
        <tr valign="top">
          <th class="categorylist">Block</th>
          <th class="categorylist">Name</th>
          <th class="categorylist">Java Class</th>
          <th class="categorylist">Description</th>
        </tr>
      </thead>
      <tbody>
        <!-- MBlock -->
        <tr valign="top">
          <td bgcolor="#f3f4f5">
            <p><img src="images/mblock.png" alt="LTPDA Block" border="3"  width="250px"></p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>LTPDA Block</p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>MBlock</p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>A block that represents a method of one of the LTPDA user classes. These blocks hold a parameter list (plist)
              which can be set in the parameter table. They can have any number of input and output ports that the underlying
            algorithm supports.</p>
          </td>
        </tr>
        <!-- MSubsystem -->
        <tr valign="top">
          <td bgcolor="#f3f4f5">
            <p><img src="images/msubsystem.png" alt="MSubsystem Block" border="3" width="250px"></p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>Subsystem Block</p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>MSubsystem</p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>A block that represents a subsystem. This is a view of another pipeline that can be placed 
            on a canvas.</p>
          </td>
        </tr>
        <!-- MATBlock -->
        <tr valign="top">
          <td bgcolor="#f3f4f5">
            <p><img src="images/matblock.png" alt="MATBlock Block" border="3" width="250px"></p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>MATLAB Expression Block</p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>MATBlock</p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>A block evaluates a MATLAB expression. The result is stored in the variable and can be passed to subsequent blocks.</p>
          </td>
        </tr>
        <!-- MConstant -->
        <tr valign="top">
          <td bgcolor="#f3f4f5">
            <p><img src="images/mconstant.png" alt="MConstant Block" border="3" width="250px"></p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>MATLAB Constant Block</p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>MConstant</p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>A block evaluates a MATLAB expression and stores the result in the MATLAB workspace with the given
            variable name.
            </p>
          </td>
        </tr>
        <!-- MAnnotation -->
        <tr valign="top">
          <td bgcolor="#f3f4f5">
            <p><img src="images/mannotation.png" alt="MAnnotation Block" border="3" width="250px"></p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>Annotation Block</p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>MAnnotation</p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>A block containing editable text to allow for annotating pipelines.
            </p>
          </td>
        </tr>
        <!-- MTerminal input -->
        <tr valign="top">
          <td bgcolor="#f3f4f5">
            <p><img src="images/input_terminal.png" alt="Input Terminal" border="3" width="250px"></p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>Input Terminal</p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>MTerminal</p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>A block which represents an input terminal to a subsystem. These blocks can only be placed
            on a subsystem canavas.
            </p>
          </td>
        </tr>
        <!-- MTerminal output -->
        <tr valign="top">
          <td bgcolor="#f3f4f5">
            <p><img src="images/output_terminal.png" alt="Output Terminal" border="3" width="250px"></p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>Output Terminal</p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>MTerminal</p>
          </td>
          <td bgcolor="#f3f4f5">
            <p>A block which represents an output terminal of a subsystem. These blocks can only be placed
            on a subsystem canavas.
            </p>
          </td>
        </tr>
      </tbody>
    </table>
  </p>  
</p>